* use nightly
* switch ml cpu to ray cpu
* fix
* add pytest
* add more pytest
* add constraint
* add tensorflow
* fix merge conflict
* add tblib
* fix
* add back uninstall
* [xgboost/release] Add GPU connect user test
* Use scaling cluster
* typo
* Increase xgboost placement group timeout
* Much higher timeout
* Move os environment timeout
* Move os environ
* [dev] install xgboost-ray from master
* GPU xgboost master
* Remove master install after new xgboost release
* Install latest
* Add master test